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Concentration of credit risk (Tables)
 6 Months Ended
Dec. 31, 2022
Concentration of credit risks [Abstract]  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] Domestic and international sales from operations are as follows:
( in thousands)For the Three Months Ended December 31,For the Six Months Ended December 31,
2022202120222021
Domestic$1,734 58 %$1,360 50 %$3,354 60 %$2,985 56 %
Foreign1,271 42 %1,341 50 %2,256 40 %$2,391 44 %
Total$3,005 100 %$2,701 100 %$5,610 100 %$5,376 100 %